1 files changed, 91 insertions, 0 deletions
diff --git a/include/timebase.h b/include/timebase.h
new file mode 100644
index 00000000..11ab126f
--- /dev/null
+++ b/include/timebase.h
@@ -0,0 +1,91 @@
+/* Copyright 2013-2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Timebase helpers.
+ *
+ * Note: Only use after the TODs are in sync !
+ */
+#ifndef __TIME_H
+#define __TIME_H
+
+#include <time.h>
+
+static inline unsigned long mftb(void)
+{
+	unsigned long tb;
+
+	/* We use a memory clobber to avoid this being
+	 * moved in the instruction stream
+	 */
+	asm volatile("mftb %0" : "=r"(tb) : : "memory");
+	return tb;
+}
+
+enum tb_cmpval {
+	TB_ABEFOREB = -1,
+	TB_AEQUALB  = 0,
+	TB_AAFTERB  = 1
+};
+
+static inline enum tb_cmpval tb_compare(unsigned long a,
+					unsigned long b)
+{
+	if (a == b)
+		return TB_AEQUALB;
+	return ((long)(b - a)) > 0 ? TB_ABEFOREB : TB_AAFTERB;
+}
+
+/* Architected timebase */
+static const unsigned long tb_hz = 512000000;
+
+static inline unsigned long secs_to_tb(unsigned long secs)
+{
+	return secs * tb_hz;
+}
+
+static inline unsigned long msecs_to_tb(unsigned long msecs)
+{
+	return msecs * (tb_hz / 1000);
+}
+
+static inline unsigned long tb_to_msecs(unsigned long tb)
+{
+	return (tb * 1000) / tb_hz;
+}
+
+static inline unsigned long usecs_to_tb(unsigned long usecs)
+{
+	return usecs * (tb_hz / 1000000);
+}
+
+static inline unsigned long tb_to_usecs(unsigned long tb)
+{
+	return (tb * 1000000) / tb_hz;
+}
+
+extern unsigned long timespec_to_tb(const struct timespec *ts);
+
+/* wait_poll - Wait a certain number of TB ticks while polling FSP */
+extern void time_wait(unsigned long duration);
+
+/* wait_poll_ms - Wait a certain number of milliseconds while polling FSP */
+extern void time_wait_ms(unsigned long ms);
+
+/* wait_poll_us - Wait a certain number of microseconds while polling FSP */
+extern void time_wait_us(unsigned long us);
+
+#endif /* __TIME_H */